disadvantage of too many relays

[wewoy_romero]

tulong naman po, mga sirs

[Yoda]

1. eh how about the car battery? would it drain faster knowing na lahat ng devices would be drawing power directly from it?

This should be a non-issue since everything would be ultimately getting its current from the battery. As long as your charging system and voltage regulator are working fine, you should be ok.

2. would it stress some of the devices knowing lahat sila nag-aagawan na current/power? would some devices na walang relay be getting less current/power?

Again, this would be a non-issue as long as the total current draw of all devices is something that the battery and charging system can handle.

A device will only draw enough current to satisfy its needs. Problems will occur if the power source cannot supply it. If it can, but the wiring has too much resistance (too old, damaged, etc), then the same thing happens. So new wiring is laid out and switched via the old wiring through a relay.

3. if the electrician nga just added another relay without checking if merong existing, would the two relays add up or useless lang?

Each relay does consume a small amount of current in order to work the switch, but this is usually negligible. So yes, it does add up, but probably not enough to be concerned about.

HTH.

[Yoda]

i noticed sa mga diagrams ng pag-add ng relays that they install fuses and have a direct connection sa car battery. with my headlight relays ganito nga (30A relays, 20A fuse). pero dun sa horn and fogs, may relay pero i don't see a direct connection sa car battery. mali ba yung gumawa or merong ibang place siya kung saan siya nag-tap ng power?

Pwede rin namang kumuha ng power sa ibang sources, basta kaya, ok lang. If you need peace of mind, you can always have it (re)checked. Multimeter lang katapat nyan.

[wewoy_romero]

*yoda
master ka nga talaga worthy, we are not

[wool]

i have relays on horn, headlight, foglights. ano bang pinakamatibay na relay sa lahat?

[dbuzz]

of too many relays means too many devices to be checked during failure/s.

sa kaso ng overrated devices, ang hdlights ang notorious kasi kahit sa stock relays lang eh tlagang super umuinit sya so, lalo na yun kung overrated ang pinalit mong hdlight. so dapat additional relay.

it is ok kung parallel connection ang gawin kasi kahati ng second relay ang current load ng device. malaki ang bawas ng heat dissipation. kaysa series na "a relay to drive a relay to drive a device."

Take note na yung 1st relay(yung original relay) ay galing sa fuse. so ang second relay if connected in parallel ay lagyan mo ng redundant fuse wired directly from the battery, only the coil supply is parallel, being shared by both relays.

[wewoy_romero]

*wool
i use bosch

thanks mga sir sa sagot

[JohnM]

Medyo OT: Readily available ba ang mga relay terminals na may lock like those that come with el cheapo relay sockets? Pinalitan ko kasi lahat ng terminals ko dahil gauge 14 ang nakakabit na wire at gusto ko thicker wire ang gamitin. Problem is yung mga terminals na nabili ko walang locks so friction lang ang humahawak sa kanila. Scary I know. Had to drive from Makati to San Juan on foglights dahil natanggal yung power ng low beam relay