Automotive → Re: [Tech] need some help re 12v Alternator

What do you use the grid tie for? Is it just to feed extra voltage back to the grid?

What confuses me is why you need to use the inverter for high load when you seem to have AC available.

Is the inverter hard wired to the home AC system?

we use the grid tie during the day it starts working early in the morning and drops off at night Sunnyboy 2500w that feeds the house during the day so we don't use the DC side till the light goes down battery's stay on float for the day
we stagger our AC use during the day making sure all white good are not on all the same time so save on high AC usage we have a smart meter that tells use what power we are drawing also how much solar is coming in / the DC inverter runs on it's own ring main to the lights and other white goods it has a 10ms switch over when the timer kicks in so the cycle every day goes grid tie runs part of the house or all at times DC inverter has it's own charger built in so the sunnyboy runs that side then at night we still use AC but part of the house runs from the DC inverter we have used the washing machine at night on DC works fine the idea of the alternator was not to run all the time at night only if i was to run something that was going to draw a lot of amps at one time it is just a crazy idea i had could top
battery bank up if needed just was not sure what size of AC motor would be best to run the alternator (have ask the Mrs can we have a 12v Kettle do you want to live in your shed so didn't go there lol)

so just a crazy idea i have this is the smart meter not sure if it's OK to post mods but for UK use only »www.britishgas.co.uk/con ··· ers.html

JB

I'm confused about this as well. If it's a grid-tie system then why are large intermittent AC loads even a concern at all?

not worried about loads during the day just the night what i wanted to do was not just run all the lighting fridge/freezer + one more freezer from the battery's but to run an extra ring main down stairs like Tv Blu ray etc nothing to heavy a load but if i was to thought the alternator would cushion the load at times just one of my crazy ideas
i am very great full for all your input it is making sense that the Ac motor will take more power to run than i will make back

sometimes some crazy ideas work

JB

picked up one of these tonight from a friend bit of bartering it is a
xantrex truecharge 20i have it hook up already and wow left it on hot mode as only need low amps out of it will test it soon put a 2K load on it say at moment 12.79v very good putting in one amp going to drop a 2 k load on it now see what meter reads will keep post open back in a min well 2k load battery's at 12.17 1,25k load battery.s 12.17 700w load battery's 12.21 that's with 2 white goods on and light in house all led 5w yep happy with that it will go back up to 12.6/7 very happy with that

have put the charger on a timer for tonight so it comes on and off as it doubled my power usage over night will still leave the selector on hot mode when battery's were off load it showed 12.9v when the grid tie kicked in and the DC inverter went to it's charge mode took 30mins for battery's to go to float instead of 2hrs so had more free electric to use from the solar but the cost of running the charger at night was twice more than i would use checked my smart meter will see what happens tomorrow at the same time see what the smart meter shows