MPPT 100/30 troubleshooting, is it bad?

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drparker151 asked Apr 4, '24

MPPT 100/30 troubleshooting, is it bad?

System: MPPT 100/30 and 150/70

Solar arrays A: single 200w panel, array B has 2s2p 200w panels. These are Rich Solar 24 panels with open circuit voltage spec of 45.4v

With array A on the 100/30 and array B on the 150/70, the 100/30 show a voltage of 45.2 and amps of .07. The 150/70 shows voltage of 72.9 and amps of 7.59.

If I swap the arrays, so B is on the 100/30 and A is the 150/70 I get voltage on the 100/30 of 89.6 and amps of .04 the 150/70 shows voltage of 36.8 and amps of 3.85.

So it appear that the 100/30 is reading voltage to high or cause the panels to see an open circuit?

Both MPPT controllers report correct battery voltage and both are in bulk mode.

Panel specs

Array A: on 100/30

Array A on 150/70

MPPT Controllers error

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klim8skeptic ♦ commented · Apr 05 at 02:03 AM

Could be a conflict between Smart Networking and DVCC if both are enabled.

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drparker151 answered · Apr 16 at 05:02 PM

My dealer sent me the tests Victron requires before authorizing a warranty claim. Tests differ depending on MPPT model. Battery connected, pv disconnected, continuity between pv posts shows a short. Warranty repair needed.

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Answer 1 · 2024-04-05T00:57:59Z

Paul B answered · Apr 05 at 12:57 AM

what are the internal settings for the 100/30 suspect the charge voltage settings are lower

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Answer 2 · 2024-04-05T03:05:08Z

drparker151 answered · Apr 05 at 03:05 AM

Was running DVCC, not smart networking. Both were disabled for this test. I've also tested with DVCC on and with DVCC off and smart networking on. I get the same results.

600ah of lithium batteries, both MPPT controllers set the same: absorption at 14.40 and float at 13.60

Both MPPT controllers to a Lynx distributor.

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Answer 3 · 2024-04-06T01:23:59Z

Paul B answered · Apr 06 at 01:23 AM

If the battery voltage wont rise - It basically is not full, Lithiums can take all the power the solar can send it and the voltage will not rise until is at around 98% full. JUST keep charging them they will fill it just takes time and also depends on the amount of solar coming in and the size of the battery bank

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Answer 4 · 2024-04-06T03:19:22Z

kevgermany answered · Apr 06 at 03:19 AM

It does look like there's a fault. What happens if only the 100/30 is used? Battery is is pretty full, but there's a reasonable SC load for it to service.

It would be worth checking what the 100/30 does when the other MPPT is completely disconnected. Also check the cabling between the 100/30 and battery. Could be a problem there.

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