Hello All

I need to think of a webrick solution for this.

Scenario I have my led lighting circuit running off a leisure battery (120ah) My cicuit when all the lights are on will draw roughly 70-90 amps. as you can imagine all the lights will not be on at once accept for the house warming and genral showing off. so you need to allow for a little diversity.

What I think I will need.

As I have been told but I dont know how true it is with a what they call a connect and forget battery charger you cannot charge the battery while it is under load or the amps being drawn has to mach or be below the rating of the charge in this case 10 amps. so i need to link either an ammeter to a brick to tell the brick when it can switch the charger on or a volt meter to see what state the battery is in and tell the brick to start switching things off to conserve power to allow charging. for my ideal scenario I would like to have both amps and volts to be monitored so that the hous will tell me what I need to do to conserve power. Yes Alistair,Guy an eggnaunciator.

Andy I just like to keep your brain hard at work keep it up

Alex

 Alex

  90A*12V = 1080W   Do you really have a whole kW of LED lighting !! if so, Respect!

  We have a solution called the URPS (Ultra Reliable Power Supply) that takes two PSU inputs and a Battery.  It charges/float charges the battery and lets you know the condtion of:

1. PSU 1
2. PSU 2
3. The Battery
4. The output

However, we rated it at 20A.  The trouble with supplies and handling is that you have to rate them for peak power otherwise they'll melt under problem conditions.

The idea of the URPS is that under Mains Failure conditions you can decide which circuits get to use the limit capacity of the Battery.

Furthermore, you'll need to think seriously about the connections taking the 90A.  These could get f.hot (flipping hot) if not up to the job.

I'd suggest that you decide on the critical circuits, keep these to about 10A worth and power the others from PSUs that are not Battery backed.

Regards

Andy 

Yes I see Your Idea that is why I opted for the leisure battery powering the led cicuits as a power supply/s would get extreemly expensive and the idea of the charger kicking in when it is needed. this is why it would be good to adapt a multi meter or some kind of thing which delivers the information to the brick, as you well know the h2m8 power supplies are rated at i think 10A thus i am running the bricks and all 12v stuff from the battery pretty green I suppose as the idea is to charge at low price times of the day and use the battery when expensive and I am looking to the futer to get a wind turbine fitted so all 12v will be run off green energy. now just to keep the record strate I am not Swampy trying to save the earth on my own it would just be good to see if my house could run (lighting Wise) in a Power cut or all the time to save the penny's or re-coup some of the enormas cost of my ideas.

P.S. any one cicuit does not exeed 7A Approx.

Alex

Andy I would just like to ask/Add

Do you know wheather it is ok to charge a battery that is under load greater than the charge output?

Alex

 This depends on the type of power supply you are using.

• If it has a current limit, then it is OK to call for a current greater than the charging current, the PSU will limit and the battery will discharge until the load is less than the charging current.
• If the PSU is a constant voltage type that you have set to 13.7V the the PSU will take the bulk of the load, if it cannot supply the load, it will complain.  Most PSUs are protected against this sort of situation, typically they will shutdown at about 130% of rated load.

Regards

Andy