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edge
Member
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# Posted: 12 May 2017 08:54pm - Edited by: edge
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i have read through tons of these threads but still a little confused
i am looking to run this inverter
http://www.canadiantire.ca/en/pdp/motomaster-eliminator-pure-sine-wave-power-inverter -1000w-0111892p.html#srp
with this charger
http://www.canadiantire.ca/en/pdp/dewalt-30a-battery-charger-with-80a-engine-start-01 11922p.html#srp
and two 120 ah batteries
this will be for a couple hours at night while the generator is off
now..... what else do I need and how do I hook it up
generator to charger to batteries to inverter
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DaveBell
Moderator
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# Posted: 13 May 2017 09:43am
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What exactly are you trying to do?
It sounds like maybe two different things, but not explained separately.
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groingo
Member
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# Posted: 13 May 2017 10:59am - Edited by: groingo
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Sounds like my old setup....wire batteries dependin on if your using a pair of 6 volt deep cells in series, (wouldn't use 12 volt batteries) plug charger into geny, charger to batteries and you can leave the inverter hooked to batteries while charging if you like while charging...your batteries will control how much juice they need.
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edge
Member
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# Posted: 13 May 2017 11:32am
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@DaveBell- I would like to be able to run the generator during the day and at night turn it off and just run off the batteries
@groingo thanks, so I don't need to add a fuse? what gage/length wires should be used for something like this ?
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DaveBell
Moderator
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# Posted: 13 May 2017 12:17pm
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The gage wire (and fuses) depends on current draw. But you are not providing that information. How much current are you drawing?
Can you please describe the complete set up from front to back as it is currently and then what you want to add/change?
Some folks have complete 12V systems and appliances, some source 12V to 120V appliances, some switch between 12v source and 120v source.
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NorthRick
Member
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# Posted: 13 May 2017 01:10pm - Edited by: NorthRick
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I couldn't bring up the charger description from the link but it says 30a in the link. So, assuming it's a 30amp charger at 12 volts the size of the wire depends on the length. You can google for "DC wire size charts" to find out what you need size-wise. You want at least a 30amp fuse/breaker on that but no bigger than the wire size can handle (the fuse is to protect the wire from burning up).
The inverter can draw up to 1000 watts at 12 volts, so 83 amps. Again the wire size is dependent on length. You would need about a 90 amp fuse/breaker with that. But, again no bigger than the wire is rated for.
Search for "Blue Sea terminal fuses" for a fairly simple way of protecting the circuits.
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edge
Member
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# Posted: 13 May 2017 07:35pm
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i will try to explain....
the cabin has a plug that connects to a generator that runs from a little shed to the cabin. the cabin has two outlets inside and one outside and has 4 light fixtures inside and 4 outside all with 5 watt LED bulbs. in the future it is possible that we would want to run a mini fridge and a very small LED TV
now i would like to connect a battery charger/batteries/inverter to the generator so the gen can be turned off from time to time
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edge
Member
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# Posted: 13 May 2017 07:38pm
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i will measure the draw next time i am there, but would be less then 100 watts as we only use lights right now
i would guess it would be under 300 even with a small tv and mini fridge?
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NorthRick
Member
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# Posted: 14 May 2017 11:29am - Edited by: NorthRick
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Is there room in the shed for batteries, inverter and charger? If so, I'd set them up in there and add a transfer switch that the output from the generator and the inverter feed into. The existing line to the cabin would tie into this switch too.
With the loads you list, 12 volt should be fine, however you list two 120ah batteries. I'm guessing that's two 12 volt batteries? If you haven't bought them yet I'd go with two 6 volt 210ah (or so) batteries. Same power capacity but the 6 volts you'd wire in series to get 12 volts. This is better for charging than two 12 volts wired in parallel.
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groingo
Member
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# Posted: 14 May 2017 12:21pm - Edited by: groingo
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Northrick summed it up, keep it simple, if you can get a pair of 6 volt deep cell golf cart batteries (much better all around than 12 volt) run them in series, into inverter (pure or modified both work fine), have your batteries in a climate controlled area or container with good ventilation, you'll likely want your inverter outside the cabin as they can be noisy, from what you have said regarding appliances a simple 16 gage power cord with multiple plugs and breaker will work fine and your set.
P.S. check battery levels weekly, have a gallon of distilled water on hand for topping off, safety glasses and fill only when batteries are not being charged or in use.
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ForceFed70
Member
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# Posted: 14 May 2017 12:46pm
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Wire the inverter for it's full potential. You never know when you'll want to use something larger than lights.
power = voltage x current
Current = power / voltage
= 1000W / 12V
= 83.33A
Looks like you'll want to use at least 2ga wire. Larger if you're planning to use more than 10' of cable.
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