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Search took 0.00 seconds. Search: Posts Made By: markopolo
Forum: Electrical | Charging, Systems, Solar and Generators 08-04-2022, 02:36 PM
Replies: 133
Views: 20,066
Posted By markopolo
My assumption is that Jiabaida is the...

My assumption is that Jiabaida is the manufacturer of these BMS boards. I don't know for certain though. LLT appeared to be a convenient English language source of the boards when I was figuring...
Forum: Electrical | Charging, Systems, Solar and Generators 08-03-2022, 01:24 PM
Replies: 133
Views: 20,066
Posted By markopolo
SF Kits use special order BMS boards from...

SF Kits use special order BMS boards from Jiabaida (JBD) AFAIK. Some SFK boards might be basically stock JBD but others allow series connections for example. The JBD/Xiaoxiang & other apps I use...
Forum: Electrical | Charging, Systems, Solar and Generators 09-11-2021, 10:12 PM
Replies: 133
Views: 20,066
Posted By markopolo
There's an In terminal and an Out terminal. LFP...

There's an In terminal and an Out terminal. LFP Positive in & positive out to the PbA. The small wire is ground. There's a photo here:...
Forum: Electrical | Charging, Systems, Solar and Generators 09-11-2021, 03:18 PM
Replies: 133
Views: 20,066
Posted By markopolo
The voltage hand-off / sharing from LFP to AGM is...

The voltage hand-off / sharing from LFP to AGM is ideal.

11976

I put 3 50A Ideal Diodes in parallel and it worked as expected. Minimal (almost unnoticeable) voltage drop, no heat, zero reverse...
Forum: Electrical | Charging, Systems, Solar and Generators 11-06-2020, 11:58 AM
Replies: 133
Views: 20,066
Posted By markopolo
From Cruising's testing, the joined Lithium...

From Cruising's testing, the joined Lithium battery and AGM battery can be pulled down to 11.95V.
Charge side relays would probably be set more to control over-voltage rather than under-voltage....
Forum: Electrical | Charging, Systems, Solar and Generators 11-06-2020, 03:26 AM
Replies: 133
Views: 20,066
Posted By markopolo
Harry - it appears that a no manual switch...

Harry - it appears that a no manual switch between AGM and Lithium system (ignoring the contactor) has been in production and right under our noses for maybe 5 years -...
Forum: Electrical | Charging, Systems, Solar and Generators 11-05-2020, 09:01 PM
Replies: 133
Views: 20,066
Posted By markopolo
Looks like there's the option for a lithium...

Looks like there's the option for a lithium battery to chassis battery in parallel if ever needing to get an emergency boost. If switches are left in the wrong positions is there a risk of a direct...
Forum: Electrical | Charging, Systems, Solar and Generators 08-26-2020, 10:04 PM
Replies: 133
Views: 20,066
Posted By markopolo
With the diode in place and no charging sources...

With the diode in place and no charging sources present, the lithium into the AGM connection is charging but it lacks the force of higher voltage. You're "charging" a high SOC AGM at maybe 13.1V at...
Forum: Electrical | Charging, Systems, Solar and Generators 08-26-2020, 03:57 PM
Replies: 133
Views: 20,066
Posted By markopolo
General comments: The diode provides...

General comments:

The diode provides isolation. I can hold an AGM at 14.4V and the LFP at 13.2V for example with the batteries connected together via the Schottky diode.

Loads on lithium would...
Forum: Electrical | Charging, Systems, Solar and Generators 08-26-2020, 01:59 PM
Replies: 133
Views: 20,066
Posted By markopolo
Thanks for the update Michael. To me, it appears...

Thanks for the update Michael. To me, it appears that the results show that the interaction between the LFP and AGM is as anticipated. The difference between straight parallel and safer parallel...
Forum: Electrical | Charging, Systems, Solar and Generators 08-25-2020, 12:32 PM
Replies: 133
Views: 20,066
Posted By markopolo
I also went back and read through the older posts...

I also went back and read through the older posts this morning about combining lead acid and lithium batteries. I missed lots of interesting stuff while wintering in Florida. I didn't get interested...
Forum: Electrical | Charging, Systems, Solar and Generators 08-25-2020, 02:45 AM
Replies: 133
Views: 20,066
Posted By markopolo
That's a fundamental difference to how I see...

That's a fundamental difference to how I see using it. I'm in favor of having them in parallel.
Forum: Electrical | Charging, Systems, Solar and Generators 08-25-2020, 02:24 AM
Replies: 133
Views: 20,066
Posted By markopolo
That is probably what Harry is doing and I...

That is probably what Harry is doing and I understand it better from your longer explanation.

I see it being used a bit differently with the lead acid kept at a higher SOC because of the newly...
Forum: Electrical | Charging, Systems, Solar and Generators 08-25-2020, 01:33 AM
Replies: 133
Views: 20,066
Posted By markopolo
The energy to get both batteries back to 100% has...

The energy to get both batteries back to 100% has to ultimately come from somewhere other than one of the batteries else they couldn't both be at 100%.

With parallel lead acid / lithium setups (of...
Forum: Electrical | Charging, Systems, Solar and Generators 08-24-2020, 11:23 PM
Replies: 133
Views: 20,066
Posted By markopolo
Michael - in this post you mentioned that the...

Michael - in this post you mentioned that the WFCO converter brings the batteries up to 13.6V - https://www.classbforum.com/forums/f23/what-can-i-expect-10921-3.html#post115236 -

Are you not...
Forum: Electrical | Charging, Systems, Solar and Generators 08-24-2020, 11:22 PM
Replies: 133
Views: 20,066
Posted By markopolo
That looks very cool :cool: Shiny is better!

That looks very cool :cool: Shiny is better!
Forum: Electrical | Charging, Systems, Solar and Generators 08-24-2020, 06:22 PM
Replies: 133
Views: 20,066
Posted By markopolo
Re: benefits - I'll add that a mixed lead acid &...

Re: benefits - I'll add that a mixed lead acid & lithium system should lessen the average depth of discharge for the lead acid battery and likely result in a better chance of it getting fully...
Forum: Electrical | Charging, Systems, Solar and Generators 08-24-2020, 05:51 PM
Replies: 133
Views: 20,066
Posted By markopolo
Yes. You get to utilize what you already have. ...

Yes. You get to utilize what you already have. Also, having a lead acid battery in the mix provides a needed 12V reference (battery) for a solar controller and inverter/charger. The lithium battery...
Forum: Electrical | Charging, Systems, Solar and Generators 08-24-2020, 05:43 PM
Replies: 133
Views: 20,066
Posted By markopolo
I think each module is 25Ah so $22 per Ah...

I think each module is 25Ah so $22 per Ah ..........
Forum: Electrical | Charging, Systems, Solar and Generators 08-24-2020, 11:38 AM
Replies: 133
Views: 20,066
Posted By markopolo
This system ->...

This system -> https://www.bos-ag.com/products/le300/ <- has been available since at least 2018 in Europe. It probably can't get easier than that.

For a DIY solution on an older van like mine it...
Forum: Electrical | Charging, Systems, Solar and Generators 08-14-2020, 02:27 PM
Replies: 133
Views: 20,066
Posted By markopolo
So the voltages shown are the actual voltages...

So the voltages shown are the actual voltages measured at or near the batteries. Are all house batteries connected to the combiner inputs or are the AGMs on the combiner output?

The flat...
Forum: Electrical | Charging, Systems, Solar and Generators 08-13-2020, 11:11 AM
Replies: 133
Views: 20,066
Posted By markopolo
Is the lithium voltage reading before or after...

Is the lithium voltage reading before or after the combiner?

The AGM's seem to be more involved than I would have guessed (if I'm interpreting the data correctly). That might be at least partly...
Forum: Electrical | Charging, Systems, Solar and Generators 08-08-2020, 02:37 PM
Replies: 133
Views: 20,066
Posted By markopolo
Really great that you can collect the data like...

Really great that you can collect the data like that. Thanks for posting it. :thumbup:
Forum: Electrical | Charging, Systems, Solar and Generators 08-05-2020, 11:14 AM
Replies: 133
Views: 20,066
Posted By markopolo
Sounds like you have a good understanding of it. ...

Sounds like you have a good understanding of it. There will be some variation as to exactly where the DC-DC charger goes but it will ultimately be after the alternator and before the lithium battery...
Forum: Electrical | Charging, Systems, Solar and Generators 08-04-2020, 10:57 AM
Replies: 133
Views: 20,066
Posted By markopolo
I figured you could use 100Ah from the Battle...

I figured you could use 100Ah from the Battle Born and 80AH from the lead acid battery. 100% DOD for the lithium & 80% DOD for the lead acid.

Harry makes a good point. It's only theory if it...
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