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Search took 0.00 seconds. Search: Posts Made By: markopolo
Forum: General Discussion Forum 12-07-2019, 12:12 PM
Replies: 62
Views: 12,021
Posted By markopolo
I'd like to know more about the voltage...

I'd like to know more about the voltage difference between cells. From the photos it was 30mV max and 20mV but your latest report indicated the max spread was now 40mV.

I wonder at what point does...
Forum: General Discussion Forum 12-05-2019, 05:23 PM
Replies: 62
Views: 12,021
Posted By markopolo
I'm sort of focusing in on balancing voltage...

I'm sort of focusing in on balancing voltage tolerance and what it should be set at and was wondering if you could post a current photo of the Silverleaf screen with a similar 4/100ths of a volt...
Forum: General Discussion Forum 11-25-2019, 01:20 PM
Replies: 62
Views: 12,021
Posted By markopolo
I posted this in the "Lithium battery warming...

I posted this in the "Lithium battery warming idea" but think that it's also useful info for this topic.

In their low temperature battery, it looks like the heating element comes on at 41F. No...
Forum: General Discussion Forum 11-23-2019, 02:10 PM
Replies: 62
Views: 12,021
Posted By markopolo
I think that you could have paralleled weak...

I think that you could have paralleled weak cells, even dead cells in the mix and still see expected pack and string voltages. Weak / dead cells would reduce the bank capacity.
Forum: General Discussion Forum 11-23-2019, 11:05 AM
Replies: 62
Views: 12,021
Posted By markopolo
Easy to follow White paper showing before and...

Easy to follow White paper showing before and after balancing results on a 12S3P LFP pack:
...
Forum: General Discussion Forum 11-23-2019, 10:20 AM
Replies: 62
Views: 12,021
Posted By markopolo
They also have Temperature Based Cutoff: I...

They also have Temperature Based Cutoff:

I haven't found specific the specific cutoff temperatures. I wonder if it's programmable?

Type 1 & Type 2 heater kits:...
Forum: General Discussion Forum 11-23-2019, 09:30 AM
Replies: 62
Views: 12,021
Posted By markopolo
Trojan's Trillium batteries low temperature...

Trojan's Trillium batteries low temperature shutoff occurs at < -13°F (-25°C) and reconnects at > -4°F (-20°C)

Trillium 110Ah battery
Maximum Charging Current @ Temperature
>73°F...
Forum: General Discussion Forum 11-23-2019, 09:05 AM
Replies: 62
Views: 12,021
Posted By markopolo
With the drop-in type batteries with internal...

With the drop-in type batteries with internal heaters, is the heater activated only when seeing a charging voltage? If so, does anyone here know specifically what voltage is needed?
Forum: General Discussion Forum 11-23-2019, 12:33 AM
Replies: 62
Views: 12,021
Posted By markopolo
120 cells in Battle Born or Renogy 100Ah...

120 cells in Battle Born or Renogy 100Ah batteries for example. 4S30P 4 series, 30 parallel.

Some Li-ion light reading: A Study of Cell-to-Cell Interactions and Degradation in Parallel Strings:...
Forum: General Discussion Forum 11-22-2019, 10:37 PM
Replies: 62
Views: 12,021
Posted By markopolo
Thanks. His batteries are still in great...

Thanks. His batteries are still in great condition. I think he always does full charge and full discharge so no PSOC cycling. I'll quote just the summary of care he nicely provided:





You...
Forum: General Discussion Forum 11-22-2019, 08:12 PM
Replies: 62
Views: 12,021
Posted By markopolo
If you have a link please post it, it could be...

If you have a link please post it, it could be interesting to read. Was it an accelerated test?
Forum: General Discussion Forum 11-22-2019, 08:01 PM
Replies: 62
Views: 12,021
Posted By markopolo
Winston - would your approach or view of...

Winston - would your approach or view of balancing change for a 4S30P battery?
Forum: General Discussion Forum 11-22-2019, 07:53 PM
Replies: 62
Views: 12,021
Posted By markopolo
Good point. Let's say temps from 32F to 14F. No...

Good point. Let's say temps from 32F to 14F. No add-ons, just as the battery was sold and usability level being that you can get into a cold soaked van, start the engine & drive without having to...
Forum: General Discussion Forum 11-22-2019, 02:10 PM
Replies: 62
Views: 12,021
Posted By markopolo
We're counting on that. :) You have a way making...

We're counting on that. :) You have a way making vital info more easily understandable and also have the patience to keep explaining it so that the rest of us catch up :thumbup:
Forum: General Discussion Forum 11-22-2019, 01:08 PM
Replies: 62
Views: 12,021
Posted By markopolo
That was the BMS balancing voltage. It'll vary...

That was the BMS balancing voltage. It'll vary depending on which BMS is chosen. Battle Born chose to use a BMS that balances the cells at 14V for example.

My understanding is that LiFePO4...
Forum: General Discussion Forum 11-22-2019, 11:24 AM
Replies: 62
Views: 12,021
Posted By markopolo
LiFePO4 with cold temperature protection (lithium)

It would be good if we could list LiFePO4 battery brands/models that have at least some built-in cold temperature protection. I'll list two that I know of. Please include temperature specifics and...
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