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Old 07-28-2017, 01:08 AM   #251
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Thanks for that info. I wonder if the chasis battery were to die if you could use that aux AGM to jump it. Would be a very short set of jumper cables needed.

Yes you can,
and you don't need a long jumper cable.
There is a jump port right in the engine bay.

When you get all settled down,
you can consider this upgrade:

LSL Products / LSLProducts.com - Problem-Solving Gear & Gadgets
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Old 07-28-2017, 01:09 AM   #252
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Yes you can,
and you don't need a long jumper cable.
There is a jump port right in the engine bay.

When you get all settled down,
you can consider this upgrades:

LSL Products / LSLProducts.com - Problem-Solving Gear & Gadgets
Awesome, thanks!
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Old 07-28-2017, 01:10 AM   #253
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...

The only thing powered besides the frig is the fantastic fan.
... and 4 BMS
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Old 07-28-2017, 01:11 AM   #254
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Unit has been on shore power charging for 8+ hours now. Was reading 12.39 on the volt meter with all 8 batteries on, the inverter on, and shore power connected.

I then turned off the inverter and started up the engine to see what the GU shows while idling.

Initially it showed 13.30 for a few seconds and then dropped down and is maintaining 13.24 for a bit and now it shows 13.23 after about three minutes.

The only thing powered besides the frig is the fantastic fan.
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... and 4 BMS
Actually 8 BMS...

It's showing 13.22 now. Not sure if this is an indication of the GU working properly or not....
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Old 07-28-2017, 01:16 AM   #255
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Got down to 13.21 so I turned off all but one ecotrek. It's showing 13.20 and I'll just see if the GU does anything with that single one.

Edit now showing 13.19.

Minutes later now showing 13.18.

It seems to me that the GU is not charging the ecotreks while idling. One ecotrek and the fantastic fan running and the frig, and the voltage is dropping.

Going to put shore power back on for now.
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Old 07-28-2017, 01:25 AM   #256
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Actually 8 BMS...

It's showing 13.22 now. Not sure if this is an indication of the GU working properly or not....

You are feeling the BMS burn.

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Old 07-28-2017, 01:27 AM   #257
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What was the voltage when you started the engine? If it was above 12.8-13.0 volts, the Balmar regulator could have seen what it thought were full batteries and not done a charge cycle, so it would be at float at best, and temp corrected on top of that.
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Old 07-28-2017, 01:27 AM   #258
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Originally Posted by WingedRyno View Post
Thanks for that info. I wonder if the chasis battery were to die if you could use that aux AGM to jump it. Would be a very short set of jumper cables needed.
It's definitely worth checking out because Murphy's law guarantees that it's only a question of when, not if.

A good quality AGM derates about 15-20% for an equivalent size starting battery. Diesels typically require beefier starting battery support than gassers but I don't know if this is the case with a Mercy diesel. In any event, if the engine battery isn't completely discharged and just clicks the solenoid, bridging it with the AGM would probably do the trick. However, I would disconnect them ASAP after engine start. The alternator probably couldn't care less but I wouldn't risk the chance of damaging the Balmar regulator.

That said, acknowledging my remarkable success in trashing batteries, I opt for carrying one of the recently available lithium battery jump starters that aren't much bigger than a brick. I got the NOCO jump starter which works very well and will assist batteries to start that are deader than a door nail. And in the unlikely event of an AGM battery failure, it can be used to facilitate a reset to get liftoff from your GU or shore power.
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Old 07-28-2017, 01:48 AM   #259
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It's definitely worth checking out because Murphy's law guarantees that it's only a question of when, not if.

A good quality AGM derates about 15-20% for an equivalent size starting battery. Diesels typically require beefier starting battery support than gassers but I don't know if this is the case with a Mercy diesel. In any event, if the engine battery isn't completely discharged and just clicks the solenoid, bridging it with the AGM would probably do the trick. However, I would disconnect them ASAP after engine start. The alternator probably couldn't care less but I wouldn't risk the chance of damaging the Balmar regulator.

That said, acknowledging my remarkable success in trashing batteries, I opt for carrying one of the recently available lithium battery jump starters that aren't much bigger than a brick. I got the NOCO jump starter which works very well and will assist batteries to start that are deader than a door nail. And in the unlikely event of an AGM battery failure, it can be used to facilitate a reset to get liftoff from your GU or shore power.

I have a lithium jumpstarter also-just in case
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Old 07-28-2017, 02:17 AM   #260
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What was the voltage when you started the engine? If it was above 12.8-13.0 volts, the Balmar regulator could have seen what it thought were full batteries and not done a charge cycle, so it would be at float at best, and temp corrected on top of that.
It was 13.39 before I started the engine with all 8 batteries charging. Flipped off the inverter and started the engine and it dropped.
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