Victron easysolar 12/1600/70 Shuts off when sun goes down

DIY
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1

Since one month or so my Victron easysolar 12/1600/70 shuts down when I connect and start an AC device with more Watts than say 300 watts or so.

The device starts but immediately shuts off and victron is then shut off too. Result is fir example in the evening the system shuts off when the fridge switches on and wont switch back on untill the following day when the sun is back.

Lately I notice in the evening the voltage says 9.8 or so while during the day the voltage is 13,5 or so and we hardly use anything and have 4 years old 2x170Ah batteries.

Until one month ago everything worked flawless.

I connected some DC plugs a while ago but not sure if it was around the same time and they still work fine even if the victron switches off.

does anyone have a clue?

2

The victron probably shuts off on low voltage, either you have a bad connection or empty/faulty batteries.

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3

Sounds like a bad connection to the battery.

Check all connections and fuses between the battery and the EasySolar.

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4

Ok, thanx, I will try/check that and report back here!

5

Connections between victron and batteries are all fine. My supplier says it must be bad batteries. Batteries are 2x 170AH 12V Victron AGM super cycle. The easysolar protects them against overloading or deep unloading I think? Can’t believe these are broken after 3,5 years(!?)

I watched the system closely for a while today: voltage was 14,1 at 3pm. Then the fridge started and voltage dropped until 11, 10, 9,3 volts (I can see the actual voltage at a 12volt socket in the wall). After a minute or so, the system switched to ‘charge only’. A few minutes later the system switched back to ‘on’, a gew minutes more the voltage got back to 14, the system switched from ‘bulk’ to ‘absorption’.

Hopefully this gives more info?

6

3.5 years of daily cycles are 1277 cycles. Victron AGM super cycle are rated for at least 1000 cycles, so i guess they’ve achieved their rating

7

Ok.. so then would it be better to disconnect the batteries in the winter from now on? They are installed in an offgrid tiny summerhouse. In the winter we’re hardly there.

8

So they did not experience daily cycles, at least not year round. If they are left unconnected for too long then they will also get damaged due to self-discharge. Maybe theres some optimisation in re-bulk time or max absorption time, possibly also in the charge voltages

9

Exactly. That’s why I’m rather disappointed by this lifespan. And I expect my Victron easysolar to optimize the charging for my victron batteries or am I wrong?

10

Theres no automatic optimisation, it uses the settings you set. If that means 14.6V absorption every day for 2hrs then the MPPT will do that (given that theres enough sun) whether or not that damages the batteries