I meanwhile use a cheap
350Euro 3500W Edecoa HF inverter
as boost inverter
for a Victron Mulitplus 12/3000/120 for some time and though that will help some of you too.
Reason is the victron covered 24/7/365 my everyday needs but when i converted my cat from gas to all electric galley
the VIctron Multi is not enough to drive all kitchen appliances
, means induction stove
in parallel. So I need for maybe 10min each 2nd day more then Victron can deliver, doesn't justify a 2nd Multi.
But I had my old cheap
chinese 3500W Edecoa inverter lying around and figured out how to use it to boost the victon for this 10min each 2nd day.
The 2nd inverter Edecoa is steered via the Multi and acts as fake generator
the Multi runs 24/7/365 but the Edecoa gets only switched on by the Multi if the Multi's load is above 2450W, which is normally only when we are cooking
You can simply do that in an "off grid installation" by
a) connecting the 110V/230V ouput of the 2nd inverter/Edecoa to the multi AC in.
b) connect the remote
cable from the Edecoa inverter to the primary relay of the victron multi. the relay is located at the top right corner at the Multi, on Multi 2 you find it at the bottom on the green connectors. Connect the minus to com on the relay, the plus connects on RO on the relay.
c) now connect to multi via USB to MK3 interface with a computer and VE configure software
. now go to
1) inverter tap and click "ground relay" so that the multi also connects neutral and earth when the Edecoa inverter delivers 230V into AC in (as its fake and not a real grounded generator).
tap: disable "enable charger", you have no grid connected but a fake generator=> I use the BT dongle and keep the charger
enabled but switch via the BT dongle to "inverter only mode". i use a transfer switch connected o n AC in and have on one connection the 2nd Edecoa inverter and other conncetion shorepower connected. So when i use shorepower (which is extremly seldom) then I switch that transfer switch to shorepower and turn on the charger via the BT dongle.
3)Virtual switch choose "don't use VS (virtual switch)", you should actually have that with the SBMS as you need the BMS assistent for the SBMS anyhow.
4) Go to assistent tap and choose the assistent "generator start and stop assistent". then start the assistent:
first question "tick Option1: use primary programmable relay"
2nd question: "tick Option "close the relay contact to start generator"
3rd question: " tick Option "start on load condition"
4th question next question is where you can determine the threshold from when the generator
or in this case your 2nd inverter should kick in. the multi can do 2400W constinous, so i have the following values: start generator when load higher then 2450W for 5 second" and "stop generator when load lower then 2350W for 10 seconds"
thats it. I steer the Multi via the BT dongle and connect app and i recommend that over the remote
control. Reason is that via Connect app you can choose "inverter" only.
To choose how much current
the 2nd inverter takes over you use the power
assist feature, means if you put there 10A then after the Victron Multi switches the 2nd inverter on (from 2450W on), it will take up to 10A with 230V=2300W so you have 2450W+2300W=4750W inverter power
. means when Victron switches on the 2nd inverter at a load of 2800W, the Edecoa will take 2300W and the Victron 500W. The Victron also takes peak and surge loads while the cheap 2nd HF inverter supplies the base load up to eg in my case 10A=2300W, all above comes from the victron. like this a high surge cannot destroy your cheap inverter, as the Victron will take care. the switch over is like USP so no loss of data etc.
like this the Edecoa runs maybe 10min each 2nd day and will last as long as the Victron multi which runs 24/7/365.
hope that helps some of you, especially in a 12V setup as its hard to find inverters above real 2,5 kw and you most likly will need only more the 2,4kW in rare situations so the cheap HF inverter is enough.
that also works with the smaller Multi, I think the Multi 1600 is the smallest with power assist, thats what the feature you need for this setup. that setup also works if you have a Multi and a Phönix inverter and wanna connect them in series...