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Author Topic: Is AC-coupling more stress ?  (Read 3872 times)
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« Reply #15 on: March 19, 2015, 04:45:46 AM »

This should work as well  similar to FreddyUK  string combiner , or ?

for about 140 Euro

Ok .... just for 4 strings  but still ... tidy
« Last Edit: March 19, 2015, 04:56:42 AM by billi » Logged

1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
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« Reply #16 on: March 19, 2015, 09:11:29 AM »

You need to fuse positive and negative cables if the system exceeds the panel limit and requires string fuses.

The cost of carriers and fuses was crazy but now they are a fraction of the price. All you need is a 16mm drill bit for the glands. Also maybe worth considering lightning protection arrestor which can also clip on the Din rail. It will not stop a direct hit trashing the system but may prevent damage from stray high voltages from a nearby strike around the frames which can damage controllers and inverters.

As regards switching AC immersion loads - I think what you are doing is taking the power from the batteries via the inverter into the tanks? Relay on = 3kw load. What I want is direct feed from GT inverter supply only drawing surplus PV power (ie. less the onsite loads) when battery voltage is (100%) so no drain on batteries but meter keeps running heating cylinders (3 x 3kw) until they are hot and then a final air dump or whatever. I am still learning all this...
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