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Old 06-10-2016, 02:13 AM   #1
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Default ecotrek batteries using 6 internal amps

we had a post on roadtrek owners facebook about ecotrek batteries.

he was questioning why his solar could not jkeep up with his compressor fridge

it appears that each 200 amp ecotrek battery uses internally 6 amps per hour

i am reprinting his entire post of email that was sent him


Norm Schlachter OK, here is the deal. EACH of the lithium modules has an internal self-draw of about 6 Amps per hour, 24 hours per day. The solar setup can provide about 20 Amps per hour for as long as there is bright sunshine on it (6-8 hours at the most. So, 6x4=24 Amps draw x 24 hrs = 576 Amps draw per day, just doing nothing. Solar is 20x7 = 140 Amps per day charge.

576 Amps out, 140 Amps in = net loss of 436 Amps per day from an 800 Amp bank. This is without anything running. If the fridge is running that is another 3 Amps per hour draw, 24 hours per day.

So, the secret is… turn off three of the batteries if the vehicle is unattended. If the solar can put 20 amps into the battery, and there is only 6 amps draw (or 9 with the fridge), then it can keep that battery charged while there is sun on it. Each module is 200 Amps so for the rest of the night it will be able to keep going until the sun comes up again. 9Amps x 18 hrs is 162 Amps. This, too will achieve a net loss (7 hrs daylight x 11 Amps solar charge (20-9) = 77 Amps). But much more slowly, plus there are still 3 batteries fully charged left over.

Ideally if the vehicle is just going to sit unused, it should either be turned on and plugged in to keep everything charged, or everything turned off. If the idea is to just have the fridge running, plug it in and turn the inverter on.
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Old 06-10-2016, 02:34 AM   #2
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Holy cr*p, that makes davydd's ARV look like it absolutely sips power. The talk about being able to use all the battery capacity instead of 50%, and then they waste even more than they save. You would have more available power with AGMs that didn't use that much idling.

That just can't be right. And why do they talk about amps per hour instead of amp-hours for power and amps for draw?
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Old 06-10-2016, 02:35 AM   #3
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That is just crazy - what could they have in that battery module?

Actually on second thought it sounds like an internal heater when the battery temp is below 40 degF. It would be interesting if this was a cold weather condition.
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Old 06-10-2016, 02:50 AM   #4
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That is just crazy - what could they have in that battery module?

Actually on second thought it sounds like an internal heater when the battery temp is below 40 degF. It would be interesting if this was a cold weather condition.
according to the poster-no =it has nothing to do with the heaters. several roadtrekkers including a few in southern california and 470 watts of solar with multiple ecotrek batteries could not understand how they could be running out of power so quickly with just the fridge on.

the e-mail i posted is what the user said
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Old 06-10-2016, 02:54 AM   #5
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So that was an e-mail between users. I wonder what Roadtrek has to say about that.
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Old 06-10-2016, 02:54 AM   #6
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i posted it exactly as it was given.

for several months there have been questions about power. we chalked it up to the inverter.

however today this post seemed to put the issue in a different light.

Greg McHugh knows all about this maybe he will post.

the biggest issue to me is anybody who has just 1 ecotrek
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Old 06-10-2016, 02:57 AM   #7
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So that was an e-mail between users. I wonder what Roadtrek has to say about that.

No-the e-mail was from roadtrek engineering to the poster explaining to him why he was having issues and what to do,

since he has 4 batteries he was told to shut off 3 so that all solar would go to just 1 battery and slow down the loss.

he was told to only turn on the other 3 when using high wat device for longer period-most likely air conditioner
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Old 06-10-2016, 02:58 AM   #8
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If this is true, it sure explains why Roadtrek doesn't put a battery monitor in their units. I don't think the customers would be really happy about seeing that much power going to waste.
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Old 06-10-2016, 03:20 AM   #9
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That email makes no sense to me. If the batteries are losing amps then something has to be drawing the power and that seems way too much. If you shut them down would they not still be losing power if an external draw isn't involved?
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Old 06-10-2016, 10:09 AM   #10
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Correct - if shut down then no parasitic loss to BMS/monitoring etc. But no lights or fan etc. either! He proposed to shut down unneeded modules.

You have to rotate the in use module so as to balance the wear.

It would seem that it is early days still in their tech if the info given in the post is accurate.
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