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  1. C

    Remote battery kill switch

    Good morning - I installed a subwoofer assembly in the trunk corner of my BMW 330 coupe. It is bolted in, as securely as I could make it - and removing it is quite a chore ... However, it also covers the access panel to my trunk mounted battery. I understand that if/when I need to change the...
  2. D

    Car battery question

    I have just bought a new battery for my car. It's a Varta battery. Before fitting to the car I tested it with my Topdon BT50 tester and was surprised to find that the health was only 69% 689A. Charge was 100% 12.65V. Should a new battery have a health of 100% ?
  3. C

    UPS Battery Replacement

    Hi all, Will a 3000VA 1800Watts UPS that usually has 4 12v9AH batteries be able to run a single 12v 100AH battery instead? (preferably lithium) I know it won't fit in the existing unit, but will it actually charge the battery and function correctly? This is the Takealot link for the unit in...
  4. C

    Dual phase Solar install with Battery - Getting batteries to cross phases.

    Ok so I am an electrician but don't really do solar, my partners sister has a holiday let complex, due to her energy bills rising to £36k a year they are going to get a solar and battery storage system installed... They generally close over the winter so the load during the winter will be just...
  5. James

    Tesla Truck is here 1kv battery 1Mw charging!!

    Have a look at this, some serious design gone in to it, it will be interesting to see how it affects the truck market.
  6. A

    Battery trip problem developed

    Hi, My camper has a new 12v battery and I have wired up a split charge relay with a 100 amp blade fuse near van battery and a 100 amp blade fuse after the split charge relay that joins to a pair of 110 amp hour 12 volt leisure batteries wired in parallel. However, between the blade fuse...
  7. B

    Car battery charging, how high should voltage go?

    Hi, I bought a car battery charger and plugged it on my car battery to test it (normal battery not AGM). my battery was probably already fully charged because I drove with my car just before using the charger. So this happened: the voltage on the charger started at around 12v? (not sure...
  8. P

    Suggestions for battery circular saw

    I already have some 18V Milwaukee power tools and was looking for a circular saw for general wood bashing duties, though having a metal cutting blade for trunking, etc, would be jolly useful. However, not only do Milwaukee have several to chose from, they are all pretty expensive for a tool I'm...
  9. P

    Will a hybrid inverter and lifepo4 battery work as UPS?

    I live in the Philippines where the power is bad, we have constant outages and when it does work the voltage ranges from 160-255v and the hz ranges from 52-65. I had a UPS which I had replaced the battery with a bigger one but it finally blew up and now I have nothing as a backup and before I...
  10. R

    E bike Battery to power bank ?

    Anyone got any advice on how to convert a 37 v Li-Ion e bike battery into a 12 v power bank ? I will need off the shelf parts.
  11. E

    How to install additional 12V battery to run security systems

    Hello all, new here. I’m searching for advice whilst brainstorming the idea of installing an additional 12v battery in my car to supply the security systems. Some context, the car in question is infamous for being easy to pinch as it is easy to access the battery, disconnect it without setting...
  12. M-B-Electrical-Services

    UK Client wants a battery back up

    Hi all, I have a regular client who has asked for a battery back up system to be installed at their home. They live in a rural location on a single phase PME supply with a 100A fuse and run a business (internet based) from there too. They suffer from regular power cuts which affect the day to...
  13. ELLEQUE

    Any Boat, Yachts, or vessel electricians aboard?

    In miami, Florida,US, any boat electricians aboard?
  14. M

    Is is possible to connect a used Lithium Ion Battery from a Two Seater Smart car to an inverter?

    The idea of having electrical power from 240volt AC sockets in a sectional building not on the national grid is becoming popular among those who want to live in a tiny house. Is it possible to connect somehow a used lithium ion battery from a Two seater Smart Car to an inverter? Then to connect...
  15. X

    Solis Battery installation

    Hi we have been asked to fit a Solis batteries and inverter to an installation and I wanted to check if the battery set up detailed will work completely independent of the solar panels as they have their own micro inverters fitted. Its our first exposer to domestic battery set setup and I can't...
  16. F

    Motorhome Leisure Battery /ECU Issues

    I have a 2005 Swift Kontiki 610 Low Profile and just been doing my usual pre winter check. I should say at the outset we are still amateurs re van electrics despite having driven around Europe and the Middle East over the past decade or so. Anyway ,to my surprise, the leisure battery reading was...
  17. R

    Replace leisure battery with Cigarette socket

    Hello, I’ve got a campervan with a 75ah lead acid leisure battery. Wired via a split charge relay. Now I’m tempted to get rid of that and just use a jackery or Bluetti for my power needs. However when I remove the leisure battery, could the existing wiring be used to power a cigarette...
  18. D

    24VDC Battery Back up - with 2 x 12VDC - 100Ah Batteries - monitor and charge options.

    24VDC Battery Back up - with 2 x 12VDC - 100Ah Batteries - monitor and charge options. 2 x 100AH deep cycle batteries - wired in series. Can I use 2 x 12vdc trickle chargers to keep them charge? Can the 12vdc chargers be connected permanently while connected in series? What can I use to...
  19. G

    Battery tester that test batteries under load

    I am confused about battery testers for house hold batteries, AA, AAA, 9V, etc. Recently my smoke alarms started chirping so I changed the 9V batteries and no chirping. However, the replaced batteries tested good using GBT-500a battery tester. I was told that batteries need to be tested under...
  20. Pat H

    Critical load from PV battery

    Hi folks. I'm having a PV system installed with a 5KW Amasstore GTX5000 Battery. This comes with a critical load output. I have the spec sheet but its not clear if this output is active all the time or only engaged when the grid power goes down. I'm assuming its live all the time (unless the...

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