Does this look right re solar controller charge into AGM battery bank?

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getyrie asked Jun 21, '22

Does this look right re solar controller charge into AGM battery bank?

Hi,

I have just had installed a 100/30 MPPT solar controller. I have 3 AGM batteries running in parallel (2x100AH and 1x95AH) Yes ideally should all be same current but the 95AH came with van as auxiliary battery which I specc'd as optopnal extra.

The 2xflexible solar panels are 150w each (obscure make):

At early afternoon peak output as per MPPT was showing:

With the BMV-700 showing:

These screenshots were taken when I removed all load from the batteries by turning everything off. The way the panels are wired is that they directly charge all appliances and the battery i.e. I can turn the consumer board off and solar will still power appliances.

So, I'm a bit disappointed thatat peak I am only getting 2.65amps charging batteries - does this look / sound right as 'potentially' I could get 16 amps from the panels - I know you never get that, but is it too much to expect 8amps rather than the not too useful amount Im getting currently?

Thanks.

G.

MPPT Controllers

vechline.png (194.5 KiB)

screenshot-20220621-153711.jpg (275.5 KiB)

screenshot-20220621-153731.jpg (291.3 KiB)

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Answer 1 · 2022-06-21T16:09:52Z

getyrie answered · Jun 21, 2022 at 04:09 PM

Apologies - disregard the first screenshot - that was for the Vechline controller the MPPT replaced. The solar panel specifications are here - please refer to the ES-150 panel:

firefly.png (137.7 KiB)

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Answer 2 · 2022-06-21T17:05:24Z

seb71 answered · Jun 21, 2022 at 05:05 PM

With the panels not facing the Sun, you will not get their rated power.

Put some load on the system and see if the charger increases the power.

It might be better to wire the panels in series, like I told you in the other thread. The PV voltage is barely above the battery voltage.

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Answer 3 · 2022-06-21T20:09:24Z

getyrie answered · Jun 21, 2022 at 08:09 PM

Hi Seb....the panels are in series....I took the van back to the campervan converters to check.

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